4.10.4 Inventory CodeHS Answers

4.10.4: Inventory CodeHS general answer I see across the web:

STARTING_ITEMS_IN_INVENTORY = 20
num_items = STARTING_ITEMS_IN_INVENTORY

# Enter your code here

INVENTORY_ITEMS = 20
num = INVENTORY_ITEMS
while num > 0:
print("We have " + str(num) + " items in inventory.")
To_Buy = int(input("How many would you like to buy? "))
if To_Buy > num:
print("There is not enough in inventory for that purchase.")

This code snippet for managing an inventory system in Python has a few issues that must be addressed for it to work correctly.

Let’s provide a corrected version of the code:

STARTING_ITEMS_IN_INVENTORY = 20
num_items = STARTING_ITEMS_IN_INVENTORY

while num_items > 0:
print("We have " + str(num_items) + " items in inventory.")
to_buy = int(input("How many would you like to buy? "))

if to_buy > num_items:
    print("There is not enough in inventory for that purchase.")
else:
    num_items = num_items - to_buy
    if num_items > 0:
        print("Now we have " + str(num_items) + " items left.")
    else:
        print("All out!")
# Note: The program will exit the loop and end when num_items reaches 0 or below.

Changes made:

Removed redundant variables: The initial code declared STARTING_ITEMS_IN_INVENTORY and INVENTORY_ITEMS with the same value. I’ve removed INVENTORY_ITEMS to simplify the code.
Corrected indentation: The original code had incorrect indentation, which is crucial in Python for defining the scope of loops and conditionals.
Variable Naming: Changed To_Buy to to_buy to follow Python’s naming convention (snake_case for variables).
Loop Exit Condition: Added a check to print “All out!” only after the inventory becomes zero, and moved it outside the else clause to ensure it’s printed when inventory runs out.

This code will now correctly manage an inventory, allowing users to buy items until the inventory runs out.